Recent decades have witnessed an explosion of theoretical and empirical studies of sex allocation transforming how we understand the allocation of resources to male and female reproduction in vertebrates invertebrates protozoa and plants in this landmark book stuart west synthesizes the vast literature on sex allocation providing the conceptual framework the field has been lacking and . Sex allocation is an organisms decision on how much of its reproductive investment should be distributed to male and female functions and or offspring under most conditions the optimal ratio is 5050 but that can change under certain circumstances. Sex allocation theory provides a powerful framework for understanding a range of reproductive behavior including the numerical sex ratio of the progeny parents produce starting with evolutionary explanations for why many species have unbiased sex ratios sex ratio theory has developed to account for the major exceptions and is now extremely detailed and sophisticated because of an excellent
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